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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '303eb73da1a7259d28919d8ef071afd10c76aadfdc72d64be9d122b1ddfaebdb' 
  AND token = 'Xf0kxGGbiP6ZTPOyqPPiXPR40pFFac065i7r3rvqfvM=' 
  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"
    }
  }
}