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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e30d109b02192308a1bd7fef6583d4cbe1856afc7b24b8ee7c16b1f9e62a035a' 
  AND token = 'itcPftk3jxTRpSNrv8aaC2yT0Q/44RerNH1GfGb86lw=' 
  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"
    }
  }
}