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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4230358bf5df50f0ed05267ce3870e59beb48dcf882f2df7339c02bd576d3f3' 
  AND token = 'dZFqgg3+F0lOeW3BRMEQTpL16fHFDo4u4gg4MlzCNkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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