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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '137f7d05d23840da2b00b9362eda41283d3f95b216694e2721a712a34cb5cd48' 
  AND token = 'h8F+5gdda1+efxw86FeZ8g20CI1eiVcy6EH4zDF4afs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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