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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8aa880a9ae59d4c0c32f96f684da7ccd9983f7b7eb7a120a6d4e69e889c135c3' 
  AND token = '09TKCRoytYT6iN/ueSOm3ErAUsMkk+NerqUPsemgA0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}