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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39f6db84f98bcd793f4b6c902565b88206ea031e006dda3aeede371e53e30e26' 
  AND token = 'r7b5fUOd82aGlCLUx4autGxwGCEJ3lGt+0hz8F3Ul0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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