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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbdbc6a04effc8a7277a38bea314e618b3144da5adbfb2d8af185ad4e29aa84e' 
  AND token = 'z/P+yy6tzbZ9O8kNFFsyi/3gUrcr/t/EcR/OSKH69qk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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