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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53e98e14bff60fbd840a9d969fdcfee9046225cd97c9f22d849106d5936e1bb6' 
  AND token = '2yX/yLNUjSXbviD4vLb7cpq6dcXPLhva7PT7lsS8mSg=' 
  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"
    }
  }
}