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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cec23170f8e3d13fd64ec3bd97f5f5a5de8d510fdf9216d7336f9f12b3a39630' 
  AND token = '+KZ6954IpFQvhg89hSuFZP2pRopV5R3PWZTMG+TUmuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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