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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87d248b9c6c1dcb6c59dad192168dd7ae03ce9f1e19f08a0724a6656ce2e8373' 
  AND token = 'M4CJWGCJXK3RKT1WSz6b33zGfkHCmMPQwfSlbUGLgZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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