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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95b0273c3b68ebcbad395fb39699f23752fb0e018e04f9ecb65ce5cecb11af3b' 
  AND token = 'P6Vq/ZsgpzAJeewoW+0fyLbAAlSnI3jpEWkN2ZL71Kk=' 
  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"
    }
  }
}