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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cdb4509dc0c414bb99cec222e7a26ca07f204e3107bc09e736a112370782d7c' 
  AND token = 'nKQqeyEtZDnX2f5eQ6qu0YDYbelQ8VXDK2CZqN+fHRE=' 
  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"
    }
  }
}