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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b45e4ab1e17d1da3c9949199176ae30abfb0bff15f2fbe369cc67912f60bb846' 
  AND token = '4VUEYcXjipQ3oaVPSEL1jxm0gHDpNhtS2K2hvjiLVHw=' 
  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"
    }
  }
}