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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba6c1f5801bd8c15b7454ff731470cf2c56448f8c469aaef09f2f265791e7b85' 
  AND token = 'JVzb6111cwgO+2z1ugTvtekONbsxyE1PILbMThq4g3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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