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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48e7c895094659a935c707b5de559f2e88b26523f6fd372df0b7c503cf4094f9' 
  AND token = 'Yt3AHKJhadX9bmY52LBSxmOlG6YO5t2BVmSTP6X5rX0=' 
  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"
    }
  }
}