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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59ce26c948b3a1f9cd9218db45f30247070812ba788faa3bd817cf5b9661270a' 
  AND token = 'zmLy2CBDnSmkWDPtkk+LnpNrYBbifyjQbbTS50WK0OY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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