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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f85f3814e2f2c2b528092083659aed9f95f0c5e6932cd3ae62c97e393b69a242' 
  AND token = 'PfEd7MR+AFWMCUJJNfPy4VIDdORFsF31sDyqcgBpr2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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