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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75dd9a7e1f2e4b14f8761897dd0f3e41c03d0c2bd1e7d62f4998f2040938acf6' 
  AND token = 'hlo3jGvP4Pc7UuKBdfzsEBD05v9021npC+kW3r82J/s=' 
  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"
    }
  }
}