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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c47119fe715ecb37aa94c3c189d06f4b7faec636281db853989bedba5b950b77' 
  AND token = 'npcLdJ9Esv1S+aCSCQnWudPYR/9G3NpdDGEyVhtVEu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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