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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be8e4b7286d9c36e2d7bc03bb28f6e0037e80d2b316d407198faf6277381f784' 
  AND token = 'JCsX37//ROt67M3e+cMCT7E3Hdu9ZD/VuBcuSh08uEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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