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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaf39f787e1bd2e9c245721bee4d9d512568ee0c0901c25a9d43663e4a2f8a81' 
  AND token = '+JTwEqB/pC7mF2fPYzIpShZwPuBoS5t2RFe425ai4Mc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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